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09-10-2015 12:37 PM #1
1997 z3 failed smog 46000 orig miles only
Went to test only station (Calif). Never had a problem before. Put 1 quart of acetone in 1/2 full gas tank and drove 60 miles. It passed on the 25 mph part of the test but failed on the 15 mph.
NO was over the max. Tested at 578 AND should have been under 459. Do you think that the acetone was to much and caused this issue? Any suggestions? Normally I run regular unleaded in
this little car. Also note the test guy put the probe in the tail pipe and the put a traffic orange cone next to the tailpipe edge to keep the probe from falling out... could immediate proximity of the cone to the tail pipe obstruct flow on 15 mph test just enough to alter readings?
thanks bobReply With Quote 76.169.106.106
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09-10-2015 03:00 PM #2
Why not use premium like the manual says? What is the matter with your engine that it won't pass, and why do you think acetone helps?
When the fuel gauge says 1/2, the tank is actually down 2/3, leaving about 4 gallons. One quart of acetone in 4 gallons of gas seems like a pretty strong solvent mixture that would erode and weaken plastic and rubber in the fuel system.BMW CCA 1405
1971 2002, 1972-1975
1974 2002, 1982-1995
1997 Z3 1.9, 2012-presentReply With Quote 74.134.214.231
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09-11-2015 02:40 PM #3
z3 failed smog again
To Vintage 42
Took your advice and filled up tank with Premium. Then drove for 30 miles, then took back to smog guy... failed again with 100+ additional negative
points on the NOx... so the acetone actually was better than pure premium.
But now I have to start trouble shooting. Will start with cleaning egr valve....but I don't see anything like it on this 1997 z3 1.9. Do you know the location-- can you send a photo?
Sincerely,
bobReply With Quote 76.169.106.106
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09-11-2015 08:16 PM #4
I see you are posting the problem on both ********** and Bimmerforum. Very active forums with knowledgeable people. You should get good answers there. I don't think the 1.9 M44 engine has exhaust gas recirculation. It also has no air pump.
BMW CCA 1405
1971 2002, 1972-1975
1974 2002, 1982-1995
1997 Z3 1.9, 2012-presentReply With Quote 74.134.214.231
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11-06-2015 06:46 PM #5
Is it throwing codes?
Did you use your code reader to see if any OBD II codes were being thrown? Most auto parts shops will read codes for free.
Could be anything from bad O2 sensors to an intake leak to a bad catalytic converter.
Without a code reader you are flying blind and just attacking random parts is probably not the way to go.
I am guessing O2 sensors, even though they are supposed to last 100,000 miles, they do fail with age as well.
But remember just because the computer shows an error code mentioning a part by name DOES NOT mean that part is what is wrong.
For example, "O2 sensor out of range" may be a leak in the rubber intake elbow.
Or "Catalytic Converter Efficiency below threshold" may mean the primary O2 sensors are shot.
Google the code and your model number and you'd be surprised what you will find online. Good Luck!Reply With Quote 64.134.179.66
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11-08-2015 02:30 PM #6
EGR
Since new I have always used Regular 87 Octane gas, in my 96 - E36...no problems passing emission, but in CA is more stricter in comparison with other states. The only thing I used every 1,000 miles is fuel injector cleaner I don't know in your case will help. The crank case vent valve (EGR) in our engines is located on the driver side top of the intake manifold is round flat black in color and made of plastic with one vent hose. I usually change mine once a year due to the amount of dust here in south west.
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11-23-2015 10:04 AM #7
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11-23-2015 05:36 PM #8
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03-08-2016 08:02 PM #9
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